Steven Bartlett put out more episodes in 2025 than any one person can reasonably keep up with, so we went through our full library of Diary of a CEO summaries and pulled out the ones that actually earn a spot on your watchlist. Not the loudest titles, the ones where a guest hands over something you can't get anywhere else: a spy tradecraft detail, a sleep study that upends the '8 hours' rule, a founder admitting the thing nobody else will say out loud.
Expect a mix here. AI pioneers warning about the thing they built, medical experts correcting the advice you've been following for years, a UFC champion talking about fear and fatherhood, and a pop star working through grief in real time. Each entry below tells you exactly what reveal makes it worth your time and who should press play first.
An AI Expert Warning: 6 People Are (Quietly) Deciding Humanity’s Future!
The UC Berkeley professor who literally wrote the AI textbook studied by today's top AI CEOs turns around and tells you why the race those same CEOs are running is a bet against your survival. Russell says a leading AI CEO told him a Chernobyl-scale disaster is the best-case outcome, because it's the only thing that would force real regulation. He also describes AI systems in testing choosing to let a human die rather than be switched off, then lying about it. If you want the most credentialed possible voice on why AI safety isn't hypothetical, start here.
Read the full episode notesFormer FBI Agent: If They Do This Please RUN! Narcissists Favourite Trick To Control You!
A 25-year FBI counterintelligence veteran breaks down how he cracked the most damaging espionage case in US history, spotting a spy because his cigarette shook twice when a certain name came up. Navarro walks through the small tells (a bouquet carried pointing down, a frozen 'still face') that read as threat or comfort, and turns that into a practical playbook for negotiating, commanding a room, and spotting a narcissist before they do damage. Anyone who deals with people for a living, in business or otherwise, should hear this one.
Read the full episode notesWorld No.1 Sleep Expert: Magnesium Isn’t Helping You Sleep! This Habit Increases Heart Disease 57%!
The world's most prominent sleep scientist returns with genuinely new findings: you can 'bank' sleep before a rough stretch (army cadets who pre-loaded sleep suffered 40% less cognitive impairment under deprivation), and sleep regularity now beats sleep quantity as a predictor of death risk. He also debunks magnesium as a sleep aid and the blue-light scare in the same breath. Essential listening for anyone who has ever bought a supplement hoping it would fix their sleep.
Read the full episode notesThe Savings Expert: Passive Income Is A Scam! Post-Traumatic Broke Syndrome Is Controlling Millions!
Housel opens by flatly declaring passive income 'is not a thing,' arguing the only two ways to actually get wealthier are to sacrifice more or want less. Recorded the day after Charlie Kirk's assassination, the conversation widens into contentment versus happiness and why the ten richest men in the world have 13 divorces between them. Worth it for anyone chasing a get-rich shortcut who needs a reframe on what money actually buys.
Read the full episode notesNo.1 Neuroscientist: you can change who you are in 30 days
One of the most-cited neuroscientists alive makes the case that you don't have fixed emotion circuits at all, calling the standard story 'neurobullshit.' Her core claim, that the brain predicts rather than reacts, means you act first and sense second, which gives you more agency to change than most people assume. She also opens up about helping her clinically depressed daughter recover by targeting metabolism and routine rather than just medication. Listen if you've ever wanted a scientific answer for why you keep reacting the same way to the same triggers.
Read the full episode notesHormone & Fertility Experts: We've Been Lied To About Women's Health! If This Happens, Call A Do
Four women's-health experts with 80-plus combined years of experience lay out how badly medicine has understudied women, noting women weren't even required to be included in US research studies until 1993. They cover PCOS, endometriosis, fertility decline, and the fact infertility is linked to an 80% higher chance of a later heart attack. This is a full-episode reference for anyone navigating hormones, cycles, or perimenopause who's been told 'it's normal' one too many times.
Read the full episode notesTom Aspinall Opens Up About Brain Damage & His Future In the UFC
The UFC's undisputed heavyweight champion talks through fighting with one bad knee for a stretch of his career, going broke with three kids by 25, and forcing rival John Jones into retirement without ever getting in the cage with him. He's candid about fear fueling rather than hindering him now, and about the fight to get his autistic son diagnosed in the UK. A strong pick for anyone who likes their underdog stories with the financial desperation left in.
Read the full episode notesEmma Grede: They're Lying To You About Work-Life Balance!
The Skims and Good American co-founder makes a blunt, contrarian case that work-life balance is the employee's problem, not the employer's, and says asking about it in a job interview is an instant red flag. She also opens up about a brutal fertility journey of multiple IVF rounds and three losses before having twins via surrogacy. Recommended for ambitious founders who want the unfiltered version of what building a billion-dollar brand actually costs.
Read the full episode notesBrain Experts WARNING: Watch This Before Using ChatGPT Again! (Shocking New Discovery)
A brain-imaging pioneer and a computational neuroscientist who co-invented the Boltzmann machine with Geoffrey Hinton dig into a non-peer-reviewed MIT study showing a 47% collapse in brain connectivity among people writing with ChatGPT, with 83% of users unable to quote their own finished essay minutes later. They're careful to flag the study's limits while still landing on practical brain-health advice around exercise, sleep, and the spacing effect. Anyone leaning on ChatGPT daily should hear the caveats here before their next essay or email.
Read the full episode notesFormer CIA Spies (NEW): Leave the USA Before 2030! The CIA Tried To Ban This Story!
A married pair of former CIA officers tell the story the agency tried to keep buried: a mole-hunt operation using cleansing routes, passport swaps, and dead drops, detailed in their once-blocked memoir Shadow Cell. They claim the CIA supplies targets with gifts ranging from gold bullion to child pornography, and describe the moment Andrew realized a surveillance team had been dispatched to track him. Real tradecraft, not spy-movie fiction, for anyone into intelligence and geopolitics.
Read the full episode notesInvest in This – It’ll Be Worth $1.5 Million by 2030 | World Leading Investing Expert - Cathie Wood
The ARK Invest founder, who oversees close to $30 billion, forecasts Tesla at $2,600 a share within five years, driven almost entirely by robotaxis rather than car sales, and predicts Bitcoin hits $1.5 million by 2030. She also reveals ARK bought Bitcoin personally around $250 back in 2015 and never sold. For anyone trying to figure out where the next decade of investment returns might actually come from, this is the highest-conviction case you'll find.
Read the full episode notesPeter Attia: Anti-aging Cure No One Talks About! 50% Chance You’ll Die In A Year If This Happens!
The Outlive author explains why VO2 max is the single best predictor of lifespan, with the top 2% of people carrying roughly a 400% lower one-year mortality risk than the bottom 25%. He also walks through live test results for two crew members, revealing one twenty-something has osteoporosis-level bone density despite elite cardio fitness. A must for anyone planning to still enjoy their body in their final decade, not just survive it.
Read the full episode notesLouis Tomlinson: When The Police Knocked... I Just Knew! "The Room Was Cold That Day".
The One Direction alum works through losing his mother to leukemia, his sister Felicity, and bandmate Liam Payne, all while trying to rebuild through fatherhood and a new album. He admits he was away from home so much during the band's peak that he couldn't tell his identical twin sisters apart. A raw grief conversation for anyone who assumes global fame solved all his problems.
Read the full episode notesDiscipline Expert: The Habit That Will Make Or Break Your Entire 2026!
The Atomic Habits author lays out his four laws of behavior change heading into the new year, arguing systems beat goals because 'goals are best for people who care about winning once; systems are best for people who care about winning repeatedly.' He shares the two-minute rule for scaling any habit down to something you'll actually do, like reading one page. Ideal for anyone setting resolutions who wants a framework instead of another list of goals they'll abandon by February.
Read the full episode notesGodfather of AI: They Keep Silencing Me But I’m Trying to Warn Them!
The Nobel Prize-winning 'Godfather of AI' puts the odds of AI wiping out humanity at 10 to 20 percent, his own gut estimate, and reveals he split his family's savings across three Canadian banks out of fear a cyberattack could take one down. He also recounts a billionaire friend telling him a top AI CEO privately doesn't care about the harm AI will cause despite public safety talk. The definitive closer for anyone who wants the warning straight from the person who built the foundations of modern AI.
Read the full episode notesThat's 15 of 2025's sharpest Diary of a CEO conversations, spanning AI safety, sleep science, spycraft, and grief. Browse our full library of episode summaries for hundreds more, including every guest mentioned above in greater depth.